North Korea is believed to be moving an intercontinental ballistic missile (ICBM), a South Korean lawmaker said after being briefed by the country's intelligence service.

The lawmaker told CNN Tuesday it was unclear when the movement was detected, what the direction of the projectile was and how it was being transported. He attended the briefing by South Korea's National Intelligence Service (NIS) in Seoul on Monday.

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All eyes have been on North Korea following the country's sixth test of a nuclear weapon Sunday. Seismological data indicated the weapon was the most powerful ever detonated by the rogue nation, nuclear experts said.

North Korean state media claimed it detonated a hydrogen bomb, also known as a thermonuclear weapon, which could be fitted atop a long-range missile capable of striking the United States.

Weapons experts say it's almost impossible to verify if the warhead and missile could be successfully paired unless North Korea were to actually fire a nuclear-tipped ICBM.

The country has test-fired a number of missiles this summer, including two long-range ones in July and an intermediate-range one in August that overflew the Japanese island of Hokkaido.

The South Korean Navy announced Tuesday it conducted live-fire drills off the east coast of the Korean Peninsula to check its "immediate operational readiness."

"Wherever it is, whether on or under water, if North Korea provokes, we will immediately destroy and bury them at sea," the Navy said in a statement

U.S. Ambassador to the United Nations Nikki Haley says North Korea’s actions show that its leader, Kim Jong Un, is “begging for war,” and the time has come for the Security Council to adopt the strongest diplomatic measures.

Haley says the United States will circulate a draft resolution this week pushing further sanctions against North Korea.

“I think that North Korea basically has slapped everyone in the face in the international community that has asked them to stop,” Haley said. She added that she was aiming to put the resolution to a vote next Monday.